[INET]: Consolidate xxx_frag_create()

This one uses the xxx_frag_intern() and xxx_frag_alloc()
routines, which are already consolidated, so remove them
from protocol code (as promised).

The ->constructor callback is used to init the rest of
the frag queue and it is the same for netfilter and ipv6.
Signed-off-by: Pavel Emelyanov <xemul@openvz.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/net/inet_frag.h

@@ -39,6 +39,8 @@ struct inet_frags {
 	struct inet_frags_ctl	*ctl;
 
 	unsigned int		(*hashfn)(struct inet_frag_queue *);
+	void			(*constructor)(struct inet_frag_queue *q,
+						void *arg);
 	void			(*destructor)(struct inet_frag_queue *);
 	void			(*skb_free)(struct sk_buff *);
 	int			(*equal)(struct inet_frag_queue *q1,
@@ -53,9 +55,8 @@ void inet_frag_kill(struct inet_frag_queue *q, struct inet_frags *f);
 void inet_frag_destroy(struct inet_frag_queue *q,
 				struct inet_frags *f, int *work);
 int inet_frag_evictor(struct inet_frags *f);
-struct inet_frag_queue *inet_frag_intern(struct inet_frag_queue *q,
-		struct inet_frags *f, unsigned int hash);
-struct inet_frag_queue *inet_frag_alloc(struct inet_frags *f);
+struct inet_frag_queue *inet_frag_create(struct inet_frags *f,
+		void *create_arg, unsigned int hash);
 
 static inline void inet_frag_put(struct inet_frag_queue *q, struct inet_frags *f)
 {

include/net/ipv6.h

@@ -380,6 +380,14 @@ static inline int ipv6_prefix_equal(const struct in6_addr *a1,
 struct inet_frag_queue;
 int ip6_frag_equal(struct inet_frag_queue *q1, struct inet_frag_queue *q2);
 
+struct ip6_create_arg {
+	__be32 id;
+	struct in6_addr *src;
+	struct in6_addr *dst;
+};
+
+void ip6_frag_init(struct inet_frag_queue *q, void *a);
+
 static inline int ipv6_addr_any(const struct in6_addr *a)
 {
 	return ((a->s6_addr32[0] | a->s6_addr32[1] | 

net/ipv4/inet_fragment.c

@@ -173,7 +173,7 @@ int inet_frag_evictor(struct inet_frags *f)
 }
 EXPORT_SYMBOL(inet_frag_evictor);
 
-struct inet_frag_queue *inet_frag_intern(struct inet_frag_queue *qp_in,
+static struct inet_frag_queue *inet_frag_intern(struct inet_frag_queue *qp_in,
 		struct inet_frags *f, unsigned int hash)
 {
 	struct inet_frag_queue *qp;
@@ -208,9 +208,8 @@ struct inet_frag_queue *inet_frag_intern(struct inet_frag_queue *qp_in,
 	write_unlock(&f->lock);
 	return qp;
 }
-EXPORT_SYMBOL(inet_frag_intern);
 
-struct inet_frag_queue *inet_frag_alloc(struct inet_frags *f)
+static struct inet_frag_queue *inet_frag_alloc(struct inet_frags *f, void *arg)
 {
 	struct inet_frag_queue *q;
 
@@ -218,6 +217,7 @@ struct inet_frag_queue *inet_frag_alloc(struct inet_frags *f)
 	if (q == NULL)
 		return NULL;
 
+	f->constructor(q, arg);
 	atomic_add(f->qsize, &f->mem);
 	setup_timer(&q->timer, f->frag_expire, (unsigned long)q);
 	spin_lock_init(&q->lock);
@@ -225,4 +225,16 @@ struct inet_frag_queue *inet_frag_alloc(struct inet_frags *f)
 
 	return q;
 }
-EXPORT_SYMBOL(inet_frag_alloc);
+
+struct inet_frag_queue *inet_frag_create(struct inet_frags *f, void *arg,
+		unsigned int hash)
+{
+	struct inet_frag_queue *q;
+
+	q = inet_frag_alloc(f, arg);
+	if (q == NULL)
+		return NULL;
+
+	return inet_frag_intern(q, f, hash);
+}
+EXPORT_SYMBOL(inet_frag_create);

net/ipv4/ip_fragment.c

@@ -108,6 +108,11 @@ int ip_frag_mem(void)
 static int ip_frag_reasm(struct ipq *qp, struct sk_buff *prev,
 			 struct net_device *dev);
 
+struct ip4_create_arg {
+	struct iphdr *iph;
+	u32 user;
+};
+
 static unsigned int ipqhashfn(__be16 id, __be32 saddr, __be32 daddr, u8 prot)
 {
 	return jhash_3words((__force u32)id << 16 | prot,
@@ -146,6 +151,20 @@ static __inline__ void frag_kfree_skb(struct sk_buff *skb, int *work)
 	kfree_skb(skb);
 }
 
+static void ip4_frag_init(struct inet_frag_queue *q, void *a)
+{
+	struct ipq *qp = container_of(q, struct ipq, q);
+	struct ip4_create_arg *arg = a;
+
+	qp->protocol = arg->iph->protocol;
+	qp->id = arg->iph->id;
+	qp->saddr = arg->iph->saddr;
+	qp->daddr = arg->iph->daddr;
+	qp->user = arg->user;
+	qp->peer = sysctl_ipfrag_max_dist ?
+		inet_getpeer(arg->iph->saddr, 1) : NULL;
+}
+
 static __inline__ void ip4_frag_free(struct inet_frag_queue *q)
 {
 	struct ipq *qp;
@@ -156,14 +175,6 @@ static __inline__ void ip4_frag_free(struct inet_frag_queue *q)
 	kfree(qp);
 }
 
-static __inline__ struct ipq *frag_alloc_queue(void)
-{
-	struct inet_frag_queue *q;
-
-	q = inet_frag_alloc(&ip4_frags);
-	return q ? container_of(q, struct ipq, q) : NULL;
-}
-
 
 /* Destruction primitives. */
 
@@ -226,30 +237,20 @@ static void ip_expire(unsigned long arg)
 
 /* Creation primitives. */
 
-static struct ipq *ip_frag_intern(struct ipq *qp_in, unsigned int hash)
-{
-	struct inet_frag_queue *q;
-
-	q = inet_frag_intern(&qp_in->q, &ip4_frags, hash);
-	return container_of(q, struct ipq, q);
-}
-
 /* Add an entry to the 'ipq' queue for a newly received IP datagram. */
 static struct ipq *ip_frag_create(struct iphdr *iph, u32 user, unsigned int h)
 {
-	struct ipq *qp;
+	struct inet_frag_queue *q;
+	struct ip4_create_arg arg;
 
-	if ((qp = frag_alloc_queue()) == NULL)
-		goto out_nomem;
+	arg.iph = iph;
+	arg.user = user;
 
-	qp->protocol = iph->protocol;
-	qp->id = iph->id;
-	qp->saddr = iph->saddr;
-	qp->daddr = iph->daddr;
-	qp->user = user;
-	qp->peer = sysctl_ipfrag_max_dist ? inet_getpeer(iph->saddr, 1) : NULL;
+	q = inet_frag_create(&ip4_frags, &arg, h);
+	if (q == NULL)
+		goto out_nomem;
 
-	return ip_frag_intern(qp, h);
+	return container_of(q, struct ipq, q);
 
 out_nomem:
 	LIMIT_NETDEBUG(KERN_ERR "ip_frag_create: no memory left !\n");
@@ -642,6 +643,7 @@ void __init ipfrag_init(void)
 {
 	ip4_frags.ctl = &ip4_frags_ctl;
 	ip4_frags.hashfn = ip4_hashfn;
+	ip4_frags.constructor = ip4_frag_init;
 	ip4_frags.destructor = ip4_frag_free;
 	ip4_frags.skb_free = NULL;
 	ip4_frags.qsize = sizeof(struct ipq);

net/ipv6/netfilter/nf_conntrack_reasm.c

@@ -135,14 +135,6 @@ static void nf_frag_free(struct inet_frag_queue *q)
 	kfree(container_of(q, struct nf_ct_frag6_queue, q));
 }
 
-static inline struct nf_ct_frag6_queue *frag_alloc_queue(void)
-{
-	struct inet_frag_queue *q;
-
-	q = inet_frag_alloc(&nf_frags);
-	return q ? container_of(q, struct nf_ct_frag6_queue, q) : NULL;
-}
-
 /* Destruction primitives. */
 
 static __inline__ void fq_put(struct nf_ct_frag6_queue *fq)
@@ -184,33 +176,25 @@ static void nf_ct_frag6_expire(unsigned long data)
 
 /* Creation primitives. */
 
-static struct nf_ct_frag6_queue *nf_ct_frag6_intern(unsigned int hash,
-					  struct nf_ct_frag6_queue *fq_in)
+static struct nf_ct_frag6_queue *
+nf_ct_frag6_create(unsigned int hash, __be32 id, struct in6_addr *src,
+		struct in6_addr *dst)
 {
 	struct inet_frag_queue *q;
+	struct ip6_create_arg arg;
 
-	q = inet_frag_intern(&fq_in->q, &nf_frags, hash);
-	return container_of(q, struct nf_ct_frag6_queue, q);
-}
-
-
-static struct nf_ct_frag6_queue *
-nf_ct_frag6_create(unsigned int hash, __be32 id, struct in6_addr *src,				   struct in6_addr *dst)
-{
-	struct nf_ct_frag6_queue *fq;
+	arg.id = id;
+	arg.src = src;
+	arg.dst = dst;
 
-	if ((fq = frag_alloc_queue()) == NULL) {
-		pr_debug("Can't alloc new queue\n");
+	q = inet_frag_create(&nf_frags, &arg, hash);
+	if (q == NULL)
 		goto oom;
-	}
 
-	fq->id = id;
-	ipv6_addr_copy(&fq->saddr, src);
-	ipv6_addr_copy(&fq->daddr, dst);
-
-	return nf_ct_frag6_intern(hash, fq);
+	return container_of(q, struct nf_ct_frag6_queue, q);
 
 oom:
+	pr_debug("Can't alloc new queue\n");
 	return NULL;
 }
 
@@ -718,6 +702,7 @@ int nf_ct_frag6_init(void)
 {
 	nf_frags.ctl = &nf_frags_ctl;
 	nf_frags.hashfn = nf_hashfn;
+	nf_frags.constructor = ip6_frag_init;
 	nf_frags.destructor = nf_frag_free;
 	nf_frags.skb_free = nf_skb_free;
 	nf_frags.qsize = sizeof(struct nf_ct_frag6_queue);

net/ipv6/reassembly.c

@@ -164,17 +164,20 @@ static inline void frag_kfree_skb(struct sk_buff *skb, int *work)
 	kfree_skb(skb);
 }
 
-static void ip6_frag_free(struct inet_frag_queue *fq)
+void ip6_frag_init(struct inet_frag_queue *q, void *a)
 {
-	kfree(container_of(fq, struct frag_queue, q));
+	struct frag_queue *fq = container_of(q, struct frag_queue, q);
+	struct ip6_create_arg *arg = a;
+
+	fq->id = arg->id;
+	ipv6_addr_copy(&fq->saddr, arg->src);
+	ipv6_addr_copy(&fq->daddr, arg->dst);
 }
+EXPORT_SYMBOL(ip6_frag_init);
 
-static inline struct frag_queue *frag_alloc_queue(void)
+static void ip6_frag_free(struct inet_frag_queue *fq)
 {
-	struct inet_frag_queue *q;
-
-	q = inet_frag_alloc(&ip6_frags);
-	return q ? container_of(q, struct frag_queue, q) : NULL;
+	kfree(container_of(fq, struct frag_queue, q));
 }
 
 /* Destruction primitives. */
@@ -244,31 +247,22 @@ static void ip6_frag_expire(unsigned long data)
 
 /* Creation primitives. */
 
-
-static struct frag_queue *ip6_frag_intern(struct frag_queue *fq_in,
-		unsigned int hash)
-{
-	struct inet_frag_queue *q;
-
-	q = inet_frag_intern(&fq_in->q, &ip6_frags, hash);
-	return container_of(q, struct frag_queue, q);
-}
-
-
 static struct frag_queue *
 ip6_frag_create(__be32 id, struct in6_addr *src, struct in6_addr *dst,
 		struct inet6_dev *idev, unsigned int hash)
 {
-	struct frag_queue *fq;
+	struct inet_frag_queue *q;
+	struct ip6_create_arg arg;
 
-	if ((fq = frag_alloc_queue()) == NULL)
-		goto oom;
+	arg.id = id;
+	arg.src = src;
+	arg.dst = dst;
 
-	fq->id = id;
-	ipv6_addr_copy(&fq->saddr, src);
-	ipv6_addr_copy(&fq->daddr, dst);
+	q = inet_frag_create(&ip6_frags, &arg, hash);
+	if (q == NULL)
+		goto oom;
 
-	return ip6_frag_intern(fq, hash);
+	return container_of(q, struct frag_queue, q);
 
 oom:
 	IP6_INC_STATS_BH(idev, IPSTATS_MIB_REASMFAILS);
@@ -675,6 +669,7 @@ void __init ipv6_frag_init(void)
 
 	ip6_frags.ctl = &ip6_frags_ctl;
 	ip6_frags.hashfn = ip6_hashfn;
+	ip6_frags.constructor = ip6_frag_init;
 	ip6_frags.destructor = ip6_frag_free;
 	ip6_frags.skb_free = NULL;
 	ip6_frags.qsize = sizeof(struct frag_queue);